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European Archives of Oto-Rhino-Laryngology

, Volume 274, Issue 3, pp 1375–1381 | Cite as

Chronological changes in microbial profiles in external and middle ear diseases: a 20-year study in Korea

  • Hantai Kim
  • Oak-Sung Choo
  • Jeong Hun Jang
  • Hun Yi Park
  • Yun-Hoon Choung
Otology

Abstract

Microbial infection is one of the most significant causes of ear diseases, but microbial profiles are very diverse according to the diseases and change over time. The purpose of the study was to clarify differences and chronological changes in causative pathogens among infectious ear diseases over the last 20 years, and to identify antibiotic resistance. In total, 1191 isolates were included from patients diagnosed with chronic otitis media without cholesteatoma (COM), cholesteatomatous otitis media (Chole), middle ear effusion (MEE), including acute otitis media and otitis media with effusion, and external otitis (EO). Data were collected periodically for the years 1995, 2000, 2004, 2009, and 2013. Culture results and antibiotic resistance were assessed. The most common microorganism identified was S. aureus. The microbial profiles differed significant among the COM, Chole, and MEE groups (p < 0.001). In contrast, there was no distinct difference between COM and EO (p = 0.332). COM, Chole, and MEE also showed significant chronological changes in microbial profiles over time. The frequency of CNS increased markedly in COM and Chole (p = 0.029 and 0.028, respectively); however, S. pneumoniae infection decreased significantly in MEE (p = 0.016). Methicillin-resistant S. aureus (MRSA) demonstrated a constant trend (p = 0.564), whereas ciprofloxacin-resistant P. aeruginosa increased over time (p < 0.001). Microbial profiles have changed over a 20-year period. Increases in the frequency of coagulase-negative Staphylococcus (CNS) and bacterial resistance to ciprofloxacin, used widely in treating ear infections, are noteworthy.

Keywords

Microorganisms Ear Disease Antibiotic sensitivity Culture 

Notes

Acknowledgements

This research was supported by a grant of the Korea Health Technology R&D Project through the Korea Health Industry Development Institute (KHIDI), funded by the Ministry of Health and Welfare, Republic of Korea (HI15C0968).

Compliance with ethical standards

Conflict of interest

The authors declare no conflict of interest related to the present study.

This study was performed with the approval of the Institutional Review Board of Ajou University School of Medicine, Republic of Korea.

Informed consent

Not applicable due to a retrospective data analysis

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.Department of OtolaryngologyAjou University School of MedicineSuwonRepublic of Korea
  2. 2.Bk21 Plus Research Center for Biomedical SciencesAjou University Graduate School of MedicineSuwonRepublic of Korea

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